fix: resolve remaining errcheck lint errors in plain.go

Author: voska

internal/output/plain.go

@@ -8,9 +8,9 @@ import (
 
 func WritePlain(headers []string, rows [][]string) {
 	if len(headers) > 0 {
-		fmt.Fprintln(os.Stdout, strings.Join(headers, "\t"))
+		_, _ = fmt.Fprintln(os.Stdout, strings.Join(headers, "\t"))
 	}
 	for _, row := range rows {
-		fmt.Fprintln(os.Stdout, strings.Join(row, "\t"))
+		_, _ = fmt.Fprintln(os.Stdout, strings.Join(row, "\t"))
 	}
 }